Choose the best tool for each scenario.

Chemistry

1 answer:

Mama L [17]3 years ago

8 0

Answer:

a) Graph

b) Weight balance or gas syringe or upside-down measuring cylinder

Explanation:

a) Identifying a trend in temperature change over time - The best tool for this scenario is to represents the temperature daily, weekly, monthly or annually on graph to interpret the fluctuation in temperature owing to local seasonal changes and weather conditions

b) Measuring the mass of a product of a chemical reaction - If the product is solid or liquid then the balance is used to measure the mass. If the product is a gas, then gas syringe or upside-down measuring cylinder is used.

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If 86.1 g of nitrogen reacts with lithium how many grams of lithium will react

Dovator [93]

Answer:
128 g of Li will react with 86.1 g of N₂ to completely consume it.

Solution:

The balance chemical equation is as follow,

<span> 6 Li + N</span>₂ → 2 Li₃<span>N

According to this equation,

28 g (1 mole) N</span>₂ reacts with = 41.64 g (6 moles) of Li
So,
86.1 g of N₂ will react with = X g of Li

Solving for X,
X = (86.1 g × 41.64 g) ÷ 28 g

X = 128 g of Li

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Answer:

$\boxed{\text{ B. Increase the temperature and decrease the pressure.}}$

Explanation:

Let's say the reaction is

R ⇌ 2P; endothermic

I like to consider heat as if it were a reactant or a product in a chemical equilibrium.

Another way to write the equilibrium would be

heat + R ⇌ 2P

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